Buttercup squash vines yellowed out suddenly, Why?

Question

Other vegetables in the same garden did fine – tomatoes, peppers, peas. Squash looked great for a while, several small squash were developing, then the vines got yellow and droopy, and the squash stopped growing.

Answer 1

Your squash plants may be suffering from the onset of bacterial wilt, which will kill the plants and there is nothing to do but pull them up. Here is more information on the problem: https://www.gardeningknowhow.com/edible/vegetables/squash/signs-and-treatments-of-squash-wilt.htm